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18 Cards in this Set
- Front
- Back
invertebrate
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animal that lacks a backbone
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chordate
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animal that has for at least one stage of its life, a dorsal, hollow nerve cord, a notochord, a tall that extends beyond the anus, and pharyngeal pouches.
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notochord
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long supporting rod that runs through a chordate's body just below the nerve cord.
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pharyngeal pouch
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one of a pair of structures in the throat region of a chordate.
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vertebrate
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animal that has a backbone
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feedback inhibition
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process in which a stimulus produces a response that opposes the original stimulus.
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radial symmetry
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body plan in which any number of imaginary planes drawn through the center of the body could divide it into equal halve
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bilateral symmetry
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body plan in which a single imaginary line can divide the body into left and right sides that are mirror images of each other
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endoderm
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innermost germ layer; develops into the linings of the digestive tract and much of the respiratory system.
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mesoderm
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middle germ layer; develops into muscles, and much of the circulatory, reproductive , and excretory systems.
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ectoderm
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outermost germ layer; produces sense organs, nerves, and outer layer of skin.
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coelom
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body cavity lined with mesoderm
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pseudocoelom
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body cavity, which is only partially lined with mesoderm
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zygote
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fertilized egg
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blastula
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hollow ball of cells that develops when a zygote undergoes a series of cell visions
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protostome
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an animal whose mouth is formed from the blastspore
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deuterstome
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group of animals in which the blastopore becomes an anus, and the mouth is formed from the second opening that develops.
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cephalization
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concentration of sense organs and nerve cells at the anterior end of an animal.
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